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Lab creation

Dear all,
sorry but I'm new in Zimbra and I'd like to create a lab environment to test the product.
I did a download of Zimbra Collaboration Suite Appliance, installed (ran) in my machine and configure without any problem, but since it's a lab, I used a non existent domain, something like test.tt but when I try to send a email, it's trying to find this domain as a valid domain.... to try to solve this, I added the local address in the hosts of the physical machine (environment details below) but the problem persist... if I look the queue, I can see the error:
connect to mail.test.tt[67.215.65.132]:7025: Connection refused

Someone can help me indicating how to create a lab, without a valid domain, please?